Smoke-consuming furnace



No. 608,862. Patented Aug. 9, 18:98.

, .1. IMHOF & s. SPRING.

SMOKE CONSUMING FURNACE.

(Application filed Jan. 22, 1898.)

(No Model.)

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JOHN IMIIOF AND SAMUEL SPRING, or ALLEGHENY, PENNSYLVANIA:

SMOKE CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 608,862, dated August9, 1898. Application filed January 22,1898. Serial 1 667,650. (Nomodel.)

To (LZZ whom it may concern.-

Be it known that we, JOHN IMHOF and SAMUEL SPRING, both of Allegheny, inthe county'of Allegheny and State of Pennsyl- Vania, have invented a newand Improved Smoke-Consuming Furnace, of which the following is a full,clear, and exact description.

Our invention relates to smoke-consuming furnaces and it consists ofcertain novel features, which will be hereinafterdescribed and claimed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a longitudinal elevation of a boiler, in part, and asectional elevation of a furnace equipped with our smoke-consumingdevices, substantially on the line 1 l in Fig. 2. Fig. 2 is across-sectional elevation taken substantially on the line'2 2 in Fig. 1.Fig. 3 is a transverse sectional view substantially on the line 3 3 inFig. 1, and Fig. 4: is a detached side view of a detail of construction.

Our invention is adapted to be used in connection with any form offurnace; but as its use will be mainly confined to furnaces understeam-boilers it is so represented in the draw ings and is so describedin the specification.

The boiler A may be mounted in a setting which in the main is of anyordinary construction. This provides a furnace-chamber H, having gratesI adapted to receive the fuel. Immediately back'of the rear end of thegrates is a bridge-wall E, which is composed of fire-brick set so thatthere is a space between adjacent bricks of each row. This bridge-wallis carried close to, but not quite in contact with, the boiler, leavinga narrow space 6 between said wall and the boiler. This constructiondivides the space through which the gases must. pass into a large numberof comparatively small apertures, which are formed by the separation ofthe bricks forming the wall.

Back of the front wall is a second bridge wall F, generally locatedunder the rear of the boiler and in any case a sufficient distance fromthe front wall to provide a combustion-chamber G between the twobridgewalls. The rearbridge-wallF is constructed substantially the sameas the front wall. The

only difference in construction is that the lower layer of bricks isplaced 011 edge and extends longitudinally of the boiler, thus formingspaces f of larger area than would otherwise be provided. Preferably thebrick in this wall are more extended or placed farther apart, thusgiving an increased area for the draft.

Through the front wall of the fire-box is projected a pipe 0, which isconnected with any convenient source of steam-supply. This may beeither'the boiler A or another boiler, as desired. The pipe 0 terminatesjust inside the front wall B of the furnace and is provided with afan-shaped jet or discharge D. This jet D consists of a hollow metalnozzle which is flattened and is in general of a fan shape and isprovided with a series of small orifices (I, located in its edge andextending in a direction which will produce a fan-shaped jet of steam.This nozzle D is located just beneath the boiler and so as to dischargeits steam horizontally and to the rear, thus covering the burning fuelwith a fan-shaped jet of steam. This has a tendency to protect that partof the boiler immediately over the grates from the intense heat of thecoal and also. to cause the smoke which has been generated by thecombustion of the fuel to eddy about the furnace, and thus to becomethor oughly heated, so that complete combustion may take place. I

As the gases from the furnace have to pass through comparatively smallopenings in the bridge-wall E they will become thoroughly heated bycontact with the material compos ing said wall, and thus combustion willbe facilitated. Both of the bridge-walls will act upon the gases in thismanner. The combustion-chamber G between the two bridgewalls will have atendency to cause a thorough mixing of the gases which have not at thattime been thoroughly burned.

This construction of furnace is very simple and costs but little toconstruct. The result of its use isa thorough combustion of the softestbituminous coal,and consequently prevents discharge of smoke.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent A boiler or similar furnace, having two ICObridge-Walls located one just back of the grate, and the other near therear of the boiler and forming between them a combustion-chamber, saidbridge-Walls being formed of firebrick loosely piled so as to leavepassages between successive bricks in a row, and extending upward almostinto contact with the boiler, the openings in the forward bridgewallbeing of a uniform size and the passages through the rear bridge-Wallbeing of a larger area than those through the front bridge- Wall, andthe lowercourse of bricks in the rear bridge-Wall being on edge and withtheir tom of the chamber are discharged most rap- 2o idly.

JOHN IMHOF. SAMUEL SPRING.

Witnesses:

A. B. ANGNEY, J. P, KUNKEL.

